package com.ithm.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.ithm.reggie.common.BaseContext;
import com.ithm.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

//检查用户是否完成登录
//拦截器名称和拦截路径
@WebFilter(filterName = "LoginCheckFilter", urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //获取本次请求的URL
        String requestURI = request.getRequestURI();
        log.info("拦截到请求：{}",requestURI);

        //定义不需要拦截的路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login"
        };

        //判断本次请求是否需要处理
        boolean check = check(requestURI, urls);

        //不需要处理直接放行
        if (check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }
        //判断后台系统登录状态，已登录就放行
        if (request.getSession().getAttribute("employee")!=null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("employee"));

            Long id = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(id);

            filterChain.doFilter(request,response);
            return;
        }

        //判断移动端登录状态，已登录就放行
        if (request.getSession().getAttribute("user")!=null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("user"));

            Long id = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(id);

            filterChain.doFilter(request,response);
            return;
        }
        log.info("用户未登录");
        //未登录返回未登录结果,通过输出流的方式向客户端响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    //检查路径是否匹配，匹配就返回true放行，反之返回false
    public boolean check(String requestURI, String[] urls) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match) {
                return true;
            }
        }
        return false;
    }
}
